Mechanical Properties Geopolymer Concrete Based on Fly Ash PLTU Tanjung Jati B Jepara As An Alternative Material

Abstract

Geopolymer concrete is a new material and has very good prospects because it does not use cement, where the material uses environmentally friendly materials and is energy-efficient, because it can use industrial waste materials and manufacturing processes. Geopolymer concrete does not require too much energy, as does the process from making cement which requires at least temperatures up for 800°C. The aim of this study is to evaluate and examine the worth of geopolymer concrete’s mechanical qualities. Compression tests, split tests, and flexural strength tests on geopolymer concrete are all part of the battery of mechanical properties tests. The trial study of geopolymer concrete was used to inform the mix design employed in the production of the test specimens. Merapi sand fine aggregate, 10-20 mm coarse aggregate, PLTU Tanjung Jati B Jepara fly ash from coal waste, Na2SiO3, 8M NaOH activator, and 2% fly ash superplasticizer were employed in this research. Three 15/30 cylinders are used to test concrete’s compressive strength, three 15/30 cylinders are used to test concrete’s split tensile strength, and three 15x15x60 are used to test concrete’s flexural strength in this study. After only 28 days, testing could begin. Compressive strength was found to be 31.746 MPa, split tensile strength was 3.920 MPa, and flexural strength was found to be 4.833 MPa for geopolymer concrete.